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3.12 Refraction When a ray of light passes from a region with an index of refraction n, into a region with a different index of refraction n2, the light ray is bent (see Figure 3.20). The angle at which the light is bent is given by Snell's Law n, sin = n2 sin 2 (3-6) Region 1 Index of Refraction n Region 2 Index of Refraction n2 Region 1 ndex of Refraction n Index of Refraction n, Region 2